Electron-electron correlations in the model of mobile electron shells

A variational method is proposed that allows one to take into account elect ron-electron correlations. The variational parameters are the coordinates o f the center of a one-particle atomic orbital. The displacement introduced in this way also makes it possible to graphically describe the redistributi on of the electron density under an anisotropic external action in terms of a finite initial basis. A generalization of the traditional MO-LCAO scheme in the framework of the model proposed is considered. (C) 2000 MAIK "Nauka / Interperiodica".